S-91266A623 3/8"-16 x 7/8" ASTM F835 Alloy Steel Thread-Locking Hex Drive Flat Head Screws
Alloy Steel Thread-Locking Hex Drive Flat Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Permanent vibration resistance with nylon patch thread locking that eliminates the need for separate locking hardware
- Exceptional tensile strength of 130,000 psi ensures reliable performance in high-stress industrial applications
- Corrosion-resistant black-oxide finish on alloy steel provides enhanced durability in demanding environments
- Precision Class 3A thread fit delivers superior engagement and consistent clamping force
- Wide temperature tolerance from -65° to 250°F maintains locking integrity across extreme operating conditions
- Standard 82° countersink angle enables flush mounting for clean, professional installations
- Hex drive design allows for high-torque installation with standard tools
Professional Applications & Engineering Value
Engineered for critical industrial applications where vibration resistance and reliability are paramount, these black-oxide alloy steel flat head screws solve common fastening challenges in machinery, automotive, and heavy equipment assembly. The nylon patch locking feature provides permanent thread retention without compromising the Class 3A UNC coarse thread integrity, ensuring maintained clamp load in high-vibration environments. The combination of 130,000 psi tensile strength and Rockwell C39 hardness delivers exceptional fatigue resistance, while the fully threaded design maximizes engagement depth. The 82° countersink angle and flat head profile create seamless surface finishes, making these locking fasteners ideal for applications requiring both security and aesthetic considerations.
Specification Summary & Compliance
This 3/8"-16 UNC flat head screw features precision Class 3A thread fit with coarse thread spacing and right-hand threading. Manufactured to ASTM F835 specifications with full compliance to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards. The 7/8" length and fully threaded design ensure consistent performance across industrial applications requiring reliable, high-strength fastening solutions.
